Martin Guitars

Next generation Martin Authentic Acoustic Lifespan 2.0 strings are engineered using a new, patented anti-corrosion treatment only available from Martin. It protects the core and wrap wire to prevent corrosion without compromising tone or feel. Martin's impeccable standards for acoustic guitar tone are embedded in their string design and precision manufacturing process.
Authentic Acoustic Lifespan 2.0 strings look better, sound better, and feel better, providing a smooth playing experience that reduces finger drag. Martin Authentic Acoustic Lifespan 2.0 strings offer next generation treatment for long life, great playability and feel, and superior reliability with authentic tone.

Specifications
Gauge: Medium
E: 0.013
B: 0.017
G: 0.026
D: 0.035
A: 0.045
E: 0.056
Tension: 189.6